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Commitments and Contingent Liabilities - Other (Details) - C&F Mortgage	12 Months Ended
	Dec. 31, 2019
Commitments and Contingent Liabilities
Recourse period for early payment default, minimum	90 days
Recourse period for early payment default, maximum	1 year

X

- Definition

The maximum recourse period for residential mortgage loans sold to third parties.

+ References

No definition available.

+ Details

Name:	cffi_RecoursePeriodForEarlyPaymentDefaultMaximum
Namespace Prefix:	cffi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The minimum recourse period for early payment default on residential loans sold to third parties.

+ References

No definition available.

+ Details

Name:	cffi_RecoursePeriodForEarlyPaymentDefaultMinimum
Namespace Prefix:	cffi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	dei_LegalEntityAxis=cffi_CFMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: